este es el codigo
Código HTML:
<html>
<head>
<script>
var res, url
if ((screen.width == 800) && (screen.height == 600)){
res="800x600"
url="800x600.htm"}
else if ((screen.width == 1024) && (screen.height == 768)){
res="1024x768";
url="1024x768.htm"}
else if ((screen.width == 1152) && (screen.height == 864)){
res="1152x864";
url="1152x864.htm"}
else if ((screen.width == 1280) && (screen.height == 1024)){
res="1280x1024";
url="1280x1024.htm"}
else{
window.location.href = "otra.htm"}
function Entrar(){
window.location.href=url}
</script>
</head>
<body>
Tu Resolución de Pantalla es: <b><script>document.write(res)</script></b><br>
<a href="javascript:Entrar()">Acceda a la página correspondiente a tu resolución</a>
</body>
</html>